71821 CD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71821 CD/P4DGB Bearing Product Overview & Core Advantages
The 71821 CD/P4DGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4 tolerance class, it excels in high-speed scenarios, supporting combined loads with its optimized 15° contact angle. Its universal matchable (SU) design allows for flexible mounting in preloaded pairs, delivering enhanced system stiffness and operational reliability in compact installations.
71821 CD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71821 | Basic bearing designation indicating bore size and series. |
| CD | Specifies a 15° contact angle and optimized internal geometry for high-speed operation. |
| P4 | Indicates a high-precision tolerance class for superior running accuracy. |
| DGB | Denotes a Universal Matchable (SU) bearing, supplied as one of a pair for duplex mounting. |
71821 CD/P4DGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design and universal matching capability enable the bearing to be mounted in pairs (back-to-back, face-to-face, or tandem) to withstand significant combined radial and axial loads while providing high system rigidity.
High-Speed Performance: Featuring a lightweight phenolic cage and a 15° contact angle, this bearing achieves a high limiting speed of 16,000 rpm, making it ideal for demanding spindle applications.
Precision Engineering: Manufactured to P4 tolerance standards with tight dimensional control on the bore diameter, outside diameter, and width, ensuring minimal runout and vibration for smooth, precise operation.
Optimized Internal Geometry: With 35 high-grade chrome steel balls of precise diameter, the bearing offers a high dynamic load rating of 8348 lbf and reliable performance under continuous operation.
71821 CD/P4DGB Bearing Typical Application Areas
The 71821 CD/P4DGB is ideally suited for high-performance machinery requiring precision and speed, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Drives and Precision Instrumentation
